Enchants

• Head: Arcanum of Burning Mysteries
• Shoulder: Greater Inscription of the Storm or Master's Inscription of the Storm if having Inscription
• Cloak: Greater Speed or Lightweave Embroidery if having Tailoring
• Chest: Power Stats
• Wrists: Superior Spellpower or Fur Lining - Spell Power if having Leatherworking
• Hands: Exceptional Spellpower or Hyperspeed Accelerators if having Engineering
• Waists: Eternal Belt Buckle
• Legs: Brilliant Spellthread/Sanctified Spellthread (Tailor)
• Feet: Nitro Boots/Icewalker/Greater Spirit
• Rings: Greater Spellpower if you are Enchanter
• Weapon: Mighty Spellpower on one hands, Greater Spellpower (Staff) on staves

Gemming

Red: Runed Cardinal Ruby
Yellow: Veiled Ametrine (if need more hit) / Reckless Ametrine (if socket bonus gives 5 or more spell power)
Blue: Purified Dreadstone
Meta: Chaotic Skyflare Diamond

Don't ever use 20 hit rating gems or 20 haste gems! Instead, use Veiled Ametrine and Reckless Ametrine gems to gain 1 extra spell power from every 2 gems of these. 

Preparation for raiding (3.3.5 fresh toon)

• Head: T9 (Emblem of Triumph) or Sightless Crown of Ulmaas (HoR HC) or Hood of Fiery Aftermarth (Emblem of Triumph)
• Shoulder: Stiffened Corpse Shoulderpads (ICC Trash, usually cheap on AH) or Very Fashionable Shoulders (FoS HC) or T9 (Emblem of Triumph)

• Cloak: Disguise of the Kumiho (Emblem of Valor) or Shroud of Displacement (ToC25 BoA, usually pretty pricy)
• Chest: Ancient Polar Bear Hide (PoS HC) or Merlin's Robe (from AH/Tailoring Craft)
• Wrists: Wristguards of Subterranean Moss (PoS HC) or The Lady's Brittle Bracers (ICC BoE) or Bejeweled Wizards Bracers (from AH/Tailoring Craft) 
• Hands: Cold Sweat Grips (FoS Normal) or T9 (Emblem of Triump/VoA Fire Boss)
• Waists: Essence of Anger (FoS Normal) or Sash of Ancient (from AH/Tailoring Craft) or Braid of Salt and Fire (PoS HC)
• Legs: Legwraps of the Master Conjurer (Emblem of Conquest) or T9 (Emblem of Triumph) or Leggings of Woven Death(from AH/Tailoring Craft)
• Feet: Prelate's Snowshoes (PoS HC) or Sandals of Consecration/Deathfrost Boots (from AH/Tailoring Craft)
• Ring1: Ashen Band of Destruction (ICC reputation, catch a reputation farming group to get at least the friendly ring)
• Ring2: Band of Channeled Magic (Emblem of Valor) or Band of the Invoker (Emblem of Triumph)
• Trinket1: Sundial of the Exiled (Emblem of Heroism) or Mithril Pocketwatch (Brewfest event) or Nevermelting Ice Crystal (PoS HC) or Forge Ember (HoS HC)
• Trinket2: Abyssal Rune (ToC5 Normal)
• Weapon: Seethe (FoS HC) or Quel'Delar, Lens of the Might (Battered Hilt quest chain)
• Off-hand: Shriveled Heart (HoR HC) or Faces of Doom (inscription crafting/AH) or Ward of the Violet Citadel/Handbook of Obscure Remedies (Emblem of Triumph)
• Wand: Soulsplinter (HoR HC) or Brimstone Igniter (Emblem of Triumph) or Coffin Nail (FoS normal Trash) or Nightmare Ender (ICC BoE)

Most importantly if you want to raid seriously level up your professions (Tailoring+Engineering/JC/Enchanting), be enchanted and gemmed, try to be hit capped if possible (you can easily reach it with these items above), bring flasks and potions with yourself! With a starter gear like this above you should have no problem starting raiding!